From PBS Eons.

The Cretaceous Resinous Interval, a 54-million year period where amber was preserved in hundreds of locations across the world, was a gooey, gummy point in Earth’s history – and then amber suddenly disappeared for another 20 million years.

So, we have to ask: what exactly made this time period so very, very sticky?

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References:
https://docs.google.com/document/d/1mnMPmfRM14OOINUfMTcPSIExtKKEUCPsnpYch2vB6c8/edit?usp=sharing